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Motul would be my first choice, over Castrol (but probably the 660). Castrol is great if you are racing (i.e. swapping fluid every week or two), and on paper it can't be beat for it's relative indifference to water contamination (super high wet boil point). But in street cars it has some downsides - mainly that by not being water soluble, any excess water in the system is separated out, where it can be corroding things more aggressively (like in the old pre-ethanol gas days, when the water would sit at the bottom of the gas tank waiting to cause trouble). It is also not a good mixer with other stock fluids, so I'm told you need a double-flush to really get it swapped out. Nowhere near as big a PITA as the silicone racing fluids, but still more trouble (and price) than you need.
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